default or selected kernelversion does not have config value CONFIG_REGULATOR_BD70528.
Result is shown for kernelversion 6.8.2

ROHM BD70528 Power Regulator

modulename: bd70528-regulator.ko

configname: CONFIG_REGULATOR_BD70528

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>ROHM BD70528 Power Regulator
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This driver supports voltage regulators on ROHM BD70528 PMIC.
This will enable support for the software controllable buck
and LDO regulators.

This driver can also be built as a module. If so, the module
will be called bd70528-regulator.

source code: